Note 8 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
Jan. 31, 2024 |
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years | ||
| Share-Based Payment Arrangement, Expense | $ 0.8 | $ 0.7 | |
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 5.1 | ||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 1 month 6 days | ||